Nicotine won't stay in your system that long. And honestly I'm super addicted to nicotine and I didn't have a problem using it with bromo. It actually gave me more of a buzz, I guess almost sometimes to the point it was too much. It seemed to decrease my desire to do it as well. But anyway, you'll be fine. Just monitor how you're feeling when chewing the gum as I'm not sure what the half life of bromo is. If anything, I'd be worried about your previous day's dose affecting how you feel using the nicotine gum the next day.